Compressor



4 Sheets-Sheet l L. OCHTMAN, JR

COMPRESSOR Filed May 22, 1931 Jan. 3, 1933.

Jan. 3, 1933. 1 ocHTMAN, JR 1,892,786

COMPRESSOR Filed May 22, 1931 4 Sheets-Sheet 2 INVENTOR ATTORNEY Jan. 3, 1933. L OCHTMAN- JR 1,892,786

v INVENTO y BY Z2 f ATTORN EY Jan. 3,V 1933.

l.. ocHTMAN, JR 1,892,786

COMPRESSOR Filed May 22, 1931 4 Sheets-Sheet 4 ATTORN EY Patented Jan. 3, 1933 Unire vsrsfrss LEONARD OCHTMAN, 3R., OF PLAINFIELD, NEW JERSEY,` ASSIGNOR T0 S. E. DRESSER MANUFACTURING COMPANY, F BRADFORD, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA COMPRESSOR My invention consists in the novelfeatures hereinafter described, reference being had to the accompanying drawings, which illustrate an embodiment of'my invention in a comr pressor, and certain modifications thereof, se-

lected by me for purposes of illustration, and the said invention is fully disclosed inthe following description and claims.

My invention relates to apparat-us in which a gaseous material is taken in at one pressure and discharged against a hiv'herpressure by the reciprocating action of the piston worlring in a cylinder under the control of a reciprocating sleeve valve, and best illustrated in what is termed a sleeve valve compressor. ln apparatus of Vthis character, its usefulness has been heretofore limited by the fact that in the constructions'usually employed, and in which it is extremely desirable that the sleeve valve shall have a short stroke as compared to that of the piston, the combined areas of the discharge port or ports, which are ordinarily located in a single transverseV plane with respect to the longitudinal axis of the piston, are not suiiicient to permit a'high average piston speed without excessive velocities through the discharge port. Ithas, there fore, been impracticable heretofore to operate apparatusv of this hind at very high speeds. It is impracticable to increase the width of these discharge ports in the direction of the longitudinal axis of the piston sufiiciently to overcome this'limitation, as, in the first place, an undesirable increase in the strolre of the sleeve valve would be necessitated, and further too great clearance between the pi ston hub and cylinder head would be necessitated, without which the piston itself 'would of necessity encroach upon the discharge ports and at least partially close them as it approached the end of its compression stroke. y

The object of my nvention is to overcome this difficulty which limits the speed of operation of apparatus of this typerend inthe case of sie ve'valve compressors. limits the output thereof; and to this end my invention contemplates the provision of a plurality .of rows of discharge ports located in different transverse planes with respect to the longitudinal axis of the cylinder and piston, the

ports of each row being adapted to be placed by the sleevefvalve at the discharge end of its stroke, in communication with the main discharge passage as the piston approaches the end of its compression stroke. These separate` rows of discharge ports are so spaced with respect to the sleeve valve that after it has closed the discharge ports its movement to the opposite orinlet end of its stroke, will not open the discharge ports of any of said rows, while the strole of the sleeve valve is maintained materially less than that of the piston.V

My invention also contemplates the avoidance of excessive clearance between the head of the piston and the end of the cylinder when the piston has reached the limit of its travel toward the cylinder head, while at the same time providing suitable passages for delivering the compressed gaseous mate-V rial totheiports of all of said rows. This maybe accomplished in several ways, for ei:- ample, by providing the head of the cylinder with an extension of slightly smaller diameter than the cylinder and projecting thereinto so as to form a substantially annular passage communicating with all of said rows -of Ydischarge ports when the piston approaches the end of its compression stroke, and two, to provide the head of the piston with an extension of smaller diameter than the body thereof, so as to form an annular passage around said extension for the same purpose, and three, to provide both the piston head and the cylinder head with such extension of reduced diameter, each providing a portion of the desired annular or substantially annular passage for the purpose named.

In apparatus embodying my invention, as will hereinafter more fully appear, the stroke of the sleeve valve may be made extremely short, while the increase in discharge port area is greatlyincreased, and the apparatus may therefore be operated efciently at eX- tremely high speeds, thereby in the case of compressors, very greatly increasing the output without increasing the size or weight of the apparatus.

My invention also comprises certain novel features of construction and combination of parts hereinafter fully described and particularly pointed out in the claims.

Vhile I have herein illustrated embodiments of my invention in compressors for the compression of gaseous materials, it is to be understood that my invention is not necessarily limited to compressors, but may be employed in any other type of apparatus in which its use may be found desirable or ad vantageous.

Referring to the accompanying drawings which, as hereinbefore stated, represent several embodiment-s of my invention selected by me for purposes of illustration,

Fig. 1 represents a sectional view of a sleeve type compressor embodying my invention, the piston being shown at the eXtreme end of its compression stroke, and at the moment when it is about to begin its suction stroke.

Fig. 2 is a schematic view showing the cylinder, sleeve valve and piston in section, and the connections from the piston and sleeve valve to the driving shaft in diagrammatic form, the piston being shown at a point in its suction stroke immediately before the opening of the suction or inlet ports.

F ig. 3 is a view similar to Fig. 2, showing the piston approaching the end of its suction stroke, and the suction or inlet ports fully opened.

Fig. t is a view similar to Fig. 2, showing the piston at the beginning of its compression stroke and the suction or inlet ports closed.

Fig. 5 is a view similar to Fig. 2, showing the piston moved toward the end of its compression stroke, and immediately before the opening of the discharge ports.

Fig. 6 is a view similar to Fig. 2, showing the piston approaching the end of its compression stroke, and all of the discharge ports in fully opened position.

Fig. 7 represents a transverse sectional view on the line 7 7 of Fig. 6.

Fig. 6 represents a similar transverse section on the line 8-8 of Fig. 6.

Fig. 9 is a partial sectional view showing a piston, cylinder and sleeve valve, and illustrating a slight modification of my invention, in which the upper end of the sleeve valve is cut ofi' at a point permitting it to uncover the upper row of discharge ports, at the outlet end of its stroke, corresponding with the position in the cycle represented in Fig. 6.

Fig. 10 is a sectional view similar to Fig. 9, illustrating a slight modification, in which the two rows of discharge ports are provided in the cylinder wall instead of in the head of the cylinder, and the connecting annular passage is formed between an extension of the cylinder head and the sleeve valve.

Fig. 11 represents a transverse section on line 11p-11 of Fig. 10.

F ig. 12 represents a transverse section on line 12-12 of Fig. 10.

Fig. 13 is a view similar to Fig. 10, showing a modification of the construction illustrated in Figs. 1 to 8, in which the piston is provided with an extension projecting into a recessed portion of the cylinder head within the closing ring carried thereby, and the annular passage, connecting separate rows of discharge ports, is formed between the piston eX- tension and said closing ring.

Fig. 14e is a transverse section on line ill-11i of rig. is.

Fig. 15 is a transverse section on line 15 of Fig. 13.

Fig. 16 is a view similar to Fig. 10, illustrating a modification of the construction shown in Fig. 10, in which the piston head is provided with an extension and the annular passage for connecting the discharge ports, which are located in the cylinder wall, is provided between the extension of the piston and the sleeve valve.

Fig. 17 is a transverse section on line 17-17 of Fig. 16.

Fig. 18 is a transverse section on line 18- of Fig. 16.

Fig. 19 is a view similar to Fig. 10, showing a further modification of the construction illustrated in Fig. 10, in which both the cylinder head and the piston are provided with extensions projecting toward each other, and the annular passage connecting the discharge ports located in the cylinder walls is provided between said extensions and the sleeve valve.

Fig. 2O is a transverse section on line 2O of Fig. 19.

Fig. 21 is a transverse section on the line 21,-21 of Fig. 19.

Referring to the embodiment of my invention illustrated in Figs. 1 to 8 inclusive, in which Figures 1 to 6 indicate the positions of the parts progressively at different points in the cycle of operation, 1, represents the cylinder of a compressor for gaseous materials,

.provided at one end with a head, 2, and supported upon a suitable base. 3, which may, in turn. be supported upon a foundation in any usual or preferred manner. The lower part of the cylinder, 1, is provided with a bore, indicated at 1a, to receive a longitudinally movable sleeve valve, Ll, and the cylinder is also provided with an annular suction or inlet chamber, 5, below the upper end of said bore, communicating with the interior of said bore by an inlet port, or ports, 6, which may be in the form of a continuous opening or in the form of a series of ports separated by bridges, and in either case extending partly or entirely around the cylinder, said inlet chamber, 5, also communicates with an inlet passage, '.7, through which the supply of gaseous material to be compressed. is admitted. The upper portion of the cylinder above the bore, 1ct, is enlarged, as at 1b, to form a discharge chamber', 8, of greater diameter than the bore,

1a, which is provided with a discharge passage, 9, through which the gaseous material is discharged from thecoinpressor against the pressure in the pipe line or reservoir connected therewith. rlhe cylinder head is inserted within the -enlarged portion, 1l), of the cylinder and has its exterior cylindrical face, 2a, fitting the inner face of the sleeve valve, 4f. 'I he cylinder head is provided at its upper end with a flange, 10, engaging the upper of the cylinder, and is held in place-in any suitable manner. cylinder head is provided with an inwardly projecting extension, 2a, which extends to a point slightly above the lower end of the discharge chamber, 8, and fornis therewith an annular discharge port at the point, 11, which is controlled by the sleeve valve, as hereinafter described.

The cylinder head is provided in this instance with an auxiliary annularly disposed discharge port, indicated at 12, at a predetermined Vdistance above the annular discharge port, 11, the auxiliary discharge port, 12, being connected with the discharge port, 11, in this instance Vby an annular series of passages, 13, in the cylinder head extension, see Fig. 8, separated by narrow webs, 111, two of which are shown in elevation in Figs. 1 to 6, and which serve to support the sleeve engaging portion, 15, of the cylinder head eX- tension between the discharge ports, 11 and 12, which I terni the closing ring. It will be understood that the discharge'ports, 11 and 12, niay each comprise a single continuous port extending entirely around the cylinder or cylinder head, or may be formed by an annular row of discharge ports, as shown in sonne of the other figures hereinafter described, as 'these two constructions are obvious equivalents. In the claims I have Aused the term annularly disposed discharge ports as defining either of these forms. The essenl tial feature of the construction is that'the cylinder is provided in two or inore separated transverse planes with annularly disposed discharge ports adapted to be connected for joint operation, one of the annularly disposed discharge ports being preferably located jacent to the position of the piston at the end of its compression stroke, and another annularly disposed discharge port being located at a distance from the said position of the piston, the separated annularly disposed discharge port-s bein@r preferably connected by substantially annular connecting passage, or row of passages, extending in the direction of the axis of the piston and cylinder. In the embodiment of niv invention shown in Figs. 1 to 8, the connection between the two discharge ports consists of an annular passages forming a 'substantially annular passage, surrounding va portion of the cylinder head extension of reduced diameter, but it is obvious that, as shown in some of the The inner closedend of the sh aft, 21. In lligs. 1 nient ofthe crank pin, 22, is indicated at X,

lcharge ports, 27 and 28, are

other figures, this connecting passage may be in fact an annular passage.

416 represents the piston, which engages the inner face of the sleeve valve, 4. It will be understood that the piston will be provided with the usual piston rings, indicated at 17, engaging the inner face of the sleeve valve. l also pre er t provide the cylinder with a sealing ring, 1S, for engaging the exterior surface of the sleeve valve between the inlet ports, 6, and the discharge chamber, and the outer tace ofthe inwardly projecting portion is also preferably provided with sealing rings, as indicated in the drawing. In the construction illustrated inlligs. 1 to 8, I have illustrated the porl ion of the cylinder head between the discharge ports, and which I terin tor convenience of reference the closing ring, 15, provided with sealing rings, 19, and I have also shown an additional sealing rind, 20, located above the annular discharge port, 12.

VThe driving means for the piston and sleeve valve niay be of any usual or preferred construction, and the particular ineens illustratedV herein is shown in Fig. 1 in a schematic manner in disregard of the actual proportions. ln this instance the base, 3, is shown provided with a crank shaft, 21, which, it is to be understood, is supported in suitable bearings (not shown), and is provided with a crank pin, 22, connected. by the connecting rod, 23, with the piston, 1G. rIhe sleeve valve, d, is connectedwith a valve actuating link or rod, 24e, extending to a crank pin, 25, (or eccentric) secured to or operated by the crank toA 6 the circle of moveand the circle of movement of the crank pin, 25, (or the vaXis of the valve oneratingeccentric as the case be) is indicated at Y.

The sleeve valve, 4, is provided with inlet ports, indicated at 26, preferably an annular .row of such ports, adapted at the inlet end of the stroke of said sleeve valve, to register with the inlet ports. G, of the cylinder, as shown in El. The sleeve valve is also provided with two rows of discharge ports, 27 and 2S, in different transverse planes, adaotedto register with the discharge ports,

in a posi- 11 and 12, when the sleeve valve is tion adjacent to the outlet end of its stroke, and the piston is approaching the end of its compression stroke, as shown in Fig. G. It will be understood th at the planes in which the separate discharge ports or rows of dislocated (and tierefore the corresponding planes in which the discharge ports, or rows of discharge ports, 11 and 12, are located) inust be so arranged with respect to the stroke of the sleeve valve tnat after the discharge ports are closed,y

and the piston reaches the end of its conipression stroke the i will not be reoaened until i il l the piston again approaches the end of anvtance be other compression stroke. In the construction illustrated in the figures under consideration, l have found it possible to accomplish this result with an extremely short sleeve valve stroke, the efilective stroke of the sleeve valve being in fact slightly less than the distween the planes of the two sets of discharge ports. By this arrangement it will be seen that the capacity of' the discharge ports is doubled without increasing the stroke of the sleeve valve, and without materially increasing the clearance between the piston and the head ot the cylinder, this latter efl'ect being accomplished by the substantially annular conne ting passage between the discharge ports of the cylinder head.

By reference to Figs. l to 6, the cycle of operation of the compressor may be readily traced, it being understood thatJ Fig. l represents the position et the parts when the piston is at the end ot its inward or compression stroke. ln this position the piston crank pin, 22, is on the dead center, and the crank pin, 25, for the sleeve valve in a position past the dead center, on the opposite side ci 'the axis ot' the crank shaft, or approximately 227 in advance of the piston crank. For convenience ot reference, l will refer to the crank pin, 22, as the piston crank, and the part, 25, which represents the center of the alve actuating crank pin, or eccentric, as the valve crank. lt will be understood that power maybe transmitted to tl e crank shaft, 2l, from any suitable source ot power, in any i desired manner, either by direct connection,

or belt or other gearing. ln the present instance, the crank shaft, as shown in Fig. l, is provided with a driving pulley, indicated at :'29, and driven by means or a belt, 30, from a suitable pulley operated by any suitable source of power.

Fig. 2 represents the position ot the parts after the crank shaft has been rotated through an are of approximately at whichdtime he piston will have been moved downwardly below the cylinder inlet ports, 6. while the sleeve has been moved upwardly so as to be in position to begin the opening oit the inlet ports. During this downward movement of the piston the discharge ports remain closed, and a cert-ain amount of pressure reduction will occur within the cylinder depending upon the amount 01"' highly compressed gaseous material remaining in the piston clearance space and the annular connecting passage between the discharge ports. As the piston moves Jfurther downward, the inlet ports, 26, in the sleeve valve will he brought into partial, and finally, into complete registration with the inlet ports, (3, in the cylinder, thus admitting the gaseous material, which may be either uncompressed, or in a partially compressed condition, as the case may be.

Fig. 3 shows the position ofthe parts when registration with the lower the crank shaft has turned through approximately 1350, at which point the sleeve valve will have reached its highest position, and the valve crank will be on the dead center above the axis of the crank shaft. As the piston crank passes from this position (through an arc of approximately 75o), to the position indicated in Fig. il, or a total arc ot 2100, the piston will have reached its outermost position in the cylinder and will have started on its return stroke, and the sleeve valve will have closed the inlet ports, 6, of the cylinder, as clearly illustrated in this figure. The piston continues to move upwardly through its compression stroke, the piston crank traveling through a further arc of 60, or a total are of 2700, trom the initial position, before the discharge ports are opened, as clearly illustrated in Fig. 5.

During the next 45 of travel of the piston crank, the discharge ports, ll and 12, are gradually opened until the complete registration with the corresponding ports, 27 and 28, of the sleeve valve, opens them entirely, this position being indicated in Fig. 6, and during this portion of the stroke the highly compressed gaseous material will be forced out through both sets or discharge ports, thus facilitating the discharge of: the compressed gaseous material without excessive velocities in passing through the ports. The further upward movement of the piston completes the discharge of the gaseous material and eftects the closing of the discharge ports as the piston reaches the end of its compression stroke (see Fig. l). This completes the cycle ot operation of the compressor. It will be understood that the figures representing the degrees in the circular travel of the piston crank and valve crank noted on the several figures are approximate, and that deviations therefrom in the cycle of operation may be made without departing trom the invention.

ln some instances, and particularly where the final compression of the gaseous material is not excessively hiffh, satisfactory results may be obtained by eliminating the upper annular row of discharge ports, 28, from the sleeve valve, and cutting off the upper end of the sleeve valve, so that when in its lowest position, with the ports, 27, in discharge port, ll, the upper end of the sleeve valve, indicated at 28o, in Fig. 9, shall expose the upper discharge port, or ports, l2, of the cylinder. Obviously in such case it would be impossible to provide the exterior face of the cylinder head with a sealing ring above the discharge port, or ports, l2, but this con` struction, as illustrated in Fig. 9, would be entirely practical for certain pressures. The construction illustrated in this figure is otherwise exactly the same as that shown in Figs.

l1 to 8`, and the parts have been given the same reference characters.

In Figs. 10, 11 and 12, `in which the parts corresponding with those shown in Figs. 1 to 8, are given `the same reference numerals with the addition of 100,- the cylinderdischarge ports, 111 and112,-are located in the upper part of the wall of the cylinder, 101.,

.which in this-'instance isbored throughout its length to engage the outer face ci the sleeve valve, the portion ol' the cylinder wall between said ports and forming the closing ring, 115,-being in this instance connected to the exterior portion of the cylinder by radial webs, 114, the said ports, 111 and 112, being connected directly with the discharge chamber, 108, in turn connected with' the discharge passage, 109. In this instance the cylinder head, 102, Ais provided with an extension, 1020i, of slightly smaller diameter than the interior of the sleeve valve, and the annular passage formed between thisextension and the sleeve valve, and indicated at 118, connects. the

.upper and lower discharge ports or rows of discharge ports, when the sleeve valve is at the discharge end of its stroke, in which position it is shown in Fig. 10. Y Otherwise the structure is substantially identical with that previously described in regard to Figs. 1 to 8, and the operation is identical therewith.

In Figs. 13, 14 and 15,.in which parts corresponding to those shown in Figs. 1 to 8 inclusive, are given' the same reference characters with the addition of 200, I have illusvtrated amodiiica-tion in'which the piston 216,

is provided with an extension, 2166i, of smaller diameter than the piston proper, the said piston extension projecting into a sleeve or closing ring, 215, carrying on its exterior, the .sealing rings,.219, and connected in this instance with the cylinder head, 202. In this instance the lower discharge ports, as indicated at 211, are Jformed by an annular passage `between the lower end of the closing ring, 215, and the Vlower end of the annular discharge chamber, 208, and the upper or auxiliary dischargeiports, 212, are formed byA a horizontal annular series ofports separated by longitudinal webs, 214, which serve to connect the closing ring, 215, with the cylinder head. The annular connecting passao'e, 213, is formed between the exterior surface oic the piston extension, 216e, and the inner suriace of the closing ring, 215, as clearly illustrated in the drawings, the parts being illustrated in Fig.,13, in the same relative position in the cycle as in Fig. 6. The

construction ot the other parts of the apparatus is exactly like that shown in Figs. 1 to 8 previously described, and the operation of the compressor in this modified form isexactly the same as that previously described with reference to those ligures, and need not be repeated. y

In Figs. 16, 17 ant-118, in lwhich the parts 316, .is provided with an extension, 316e, of

slightly smaller' diameter than the interior of the sleeve valve, 304, and Jforming Athe annular passage, 313, between the piston extension and said sleeve valve, the closingring, 815, carrying the sealing rings, 3l9, being in this instance-located on the exterior of the sleeve valve in the same manner as is indicated in Figs. 107, 11 and 12, and being supported by radial webs, 314, from the upper portion of the cylinder casting. Inl this instance the main discharge port, 311, is formed by an annular passage between the lower end of the closing ring, 815, and the lower end oi the discharge chamber, 308', and the auxiliary discharge port, 312, is formed as an annular port between the upper edge of the closing ring, 315, and the upper end of the discharge chamber, 308. The other parts of the apparatus are constructed exactly as hereinbei'ore described with reference to Figs. 1 to 8, and the operation is exactly the same as that previously; described with reference to said i'igures and need not be repeated. The parts are shown in Fig. 16 in the same position with respect to the cycle of operation as in Fig. 6.

It will be understood that instead of forming the annular passage connecting the spaced discharge ports for simultaneous operation around an extension of reduced diameter formed on the cylinder head, as in Figs. 10 to12, or example, or around a piston extension o'll reduced diameter, as in Figs. 13 to 18 inclusive, both the cylinder head and the piston head may be provided with extensions of reduced diameters, the annular connect-` ing passage between the spaced discharge por-ts being yprovided in such case in part by the portion of the annular passage surrounding the cylinder head extension, and in part by the annular passage surrounding the piston head extension. In Figs. 19 to 21 inclusive, in which the parts corresponding with those shown in Figs. 1 to 8 are 4given the same reference numerals with the addition oi 400, I have illustr ted such a construction, in which the piston,` 416, is provided'with an extension, 416er, in this .instance Voii'slightly smaller diameter than the interior of the sleeve valve, 404, in a manner somewhat similar to Figs; 16 to 18, except that the extension,

416a,1is of substantially halt the longitudinal diameter of the sleeve valve, and or" substantially halt the longitudinal extent of the extension shown inFig. 10. The closing ring,

v415,'is in this instance locatedon the outer side of the sleeve valve, and is supported by the radial Webs, 414:, from the upper portion of the cylinder casting, in the same manner as in Figs. 10 to 12 and 16 to 18. The parts are illustrated in Fig. 19 in the same posi- -tion with respect to the cycle of operation as in Fig. 6, and it will be seen that as the discharge ports, 411 and 412, are simultaneously placed in communication with the cylinder by the spaced annular rows of discharge ports, 427 and i-28, of the sleeve valve, the annular connecting passage, as indicated at 413, Will be formed by the annular spaces around the piston extension, 416e, and the cylinder head extension, 402e. The operation of this modified form of the compressor will be exactly the same as that previously described With reference to Figs. 1 to 8 inclusive, and need not be repeated.

It Will be seen that in all of the modifications or embodiments of my invention herein shown and described, spaced discharge ports, preferably in the form of annular ports, or annular rows of ports, located at different points longitudinally With respect to the cylinder, and connected for simultaneous operation by a connecting passage, or passages, preferably in the form of an annular passage, or an annular row of passages extending` longitudinally with respect to the axis of the cylinder and piston, are provided, and in each modilication or embodiment of the invention, these spaced discharge ports are controlled by the sleeve valve so as to be simultaneously opened, preferably by registration with longitudinally spaced annular rows of discharge ports in the sleeve valve, so that as the piston approaches the end of its compression stroke, the compressed gaseous material Will be forced out simultaneously through said spaced discharge ports and connecting passages. This greatly increases the permissible area of the discharge ports and passages and facilitates the discharge of the compressed gas therethrough Without e2;- cessive velocities, even at piston speeds far beyond those Which can be employed at theI present time in apparatus of this general character, and without increasing the stroke of the sleeve valve, which is kept materially less than that of the piston. lt will also be seen that in all the forms of the invention shown, the separated or spaced discharge ports of the cylinder and sleeve valve are so located that these discharge ports are never opened during the movement of the sleeve valve to effect the opening of the inlet ports during the suction stroke of the piston and remain at all times closed except during the part of the cycle of operation in Which the piston is approaching the end of its compression stroke.

In the embodiments of the invention herein shown and described, I have shown tivo annular discharge ports, or rows of annular discharge ports, spaced longitudinally With respect to the. axis of the cylinder, and connected for joint operation, but I Wish it to be understood that my invention is not limited to this number, and that a larger number, as three or four sets of discharge ports spaced fromeach other longitudinally of the axis of the cylinder, connected for joint operation and controlled by the sleeve valve, in the manner described, may be employed.

lVhat I claim and desire to secure by Letters Patent is:

1. rFhe combination with a cylinder provided With a discharge passage, and a plurality of annularly disposed discharge ports locatedin different transverse planes spaced apart from each other in a direction longitudinally of the cylinder, of a reciprocating piston in said cylinder, and a reciprocating sleeve valve interposed between the cylinder and piston and provided with means for placing the interior of the cylinder Within the sleeve valve in communication with said discharge passage, through all of said discharge portsr simultaneously.

2. The combination with a cylinder provided With a discharge passage, and With a plurality of annularly disposed discharge ports separated from each other in a direction longitudinally of the cylinder, of means extending longitudinally of the cylinder for connecting the said separated annularly disposed ports, a reciprocating piston in said cylinder, and a reciprocating sleeve valve between the piston and cylinder provided with means for connecting the interior of the said cylinder Within the sleeve valve with the discharge passage through all of said discharge ports simultaneously.

3. The combination with a cylinder provided With an inlet passage, inlet ports, a discharge passage, and annularly disposed discharge ports located in different transverse planes spaced apart from each other in a direction longitudinally of the cylinder, said discharge ports being connected for joint operation, of a reciprocating piston in said cylinder, a reciprocating sleeve valve interposed between the piston and cylinder and provided with means for connecting said inlet passage and inlet ports with the interior of the cylinder Within the sleeve valve adjacent to the inlet end of the stroke of said valve, and with means for connecting said discharge passage with the interior of the cylinder Within the sleeve valve through all of said discharge ports simultaneously adjacent to the outlet end of the stroke of said valve, said discharge ports being so located With respect to the valve stroke that no one of them Will be opened at any other point in the stroke of the valve.

4. The combination with a cylinder provided With a discharge passage, and with a plurality of annularly disposed discharge ports each beinglocated in a transverse plane spaced apart in a direction longitudinally of the cylinder from another', oi a piston in said cylinder, said cylinder and. piston being provided with a substantially annular passage connecting all of said discharge ports and eX- tendinglongitudinally with respect to the cylinder, and a reciprocating sleeve valve between the piston and cylinder provided with means forV connecting said discharge passage with'y theinterior of the cylinder within the sleeve valve through all of 'the said discharge ports simultaneously.

5. The combination with a cylinder providedv with a discharge passage and with a plurality oit annularly disposed discharge ports located in diifierent transverse planes spaced apart in a direction Vlongitudinally of the cylinder, of a reciprocatingpiston in the cj-,flindenl a sleeve valve located between the pistonA and cylinder and provided with a plurality of annularlydisposed discharge ports in different transverse planes spaced apart in a direction longitudinally ot the valve and operative connections between said pistonv and sleeve valve for eilecting the substantially simultaneous registration of said discharge ports in the valve with those inthe cylinder when the piston approaches the end oi its compression stroke, said cylinder being provided with substantially annular passage extending lon itudinally with respect to the cylinder for connecting all of the discharge ports of the cylinder ior joint operation.

6. The 'combination with a cylinder provided with a discharge passageand with a plurality of annularly disposed discharge ports located in diflerent transverse planes spaced apart in a direction longitudinally of the cylinder, of a'reciprocatingpiston in' the cylinder, a. sleeve valve located between the piston and cylinder and provided with a plurality vot annularly disposed discharge ports in different transverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valvefor leilfecting the substantially'simultaneous registration of said discharge ports in the valve with 'those in the cylinder when the piston approachesthe end of its compression strolr-e, said piston and the head of the cylinder being provided the one with an extension of reduced diameter projecting toward the other and providing a substantially annular passage extending longitudinally ot the cylinder for eiecting the connection of said discharge ports. j

7. rlhe combination with a cylinder provided witli a discharge passage andv with a plurality foi" anniuarly disposed discharge ports loca 'ed in different transverse planes spaced apart in adirection longitudinally oit Vthe cylinder, of' a reciprocating piston in the cylinder, a sleeve valve located between the piston and cylinder and provided with a plurality of annularly disposed discharge ports in different transverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valve for ellecting the substantially simultaneous'registration of said discharge ports in the valve with those in the cylinder when the piston approaches the endet its compression stroke, the portions of the cylinder located between the transverse planes of said discharge ports and in engagement with the sleeve valve being connected by integral webs with adjacent portions of the cylinder.

8. VThe combination with a cylinder provided with a discharge passage and with a plurality oi annularly disposed discharge ports located in dilierent transverse planes spaced apart in a direction longitudinally of the cylinder, of a reciprocating piston in the cylinder, a sleeve valve located between the piston and cylinder, and provided with a plurality of annular-ly disposed discharge ports in diderent transverse planes longitudinally of the valve and operative connections between said piston and sleeve valve tor effecting the substantially simultaneous registration oi said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, said piston and the head of the cylinvder being provided the one with an eXtension of reduced diameter projecting toward the other, and providing a substantially annular passage extending longitudinally oi' the cylinder for effecting the connection of said discharge ports, the portions of the cylinder located between the transverse planes or" said discharge' ports and in engagement with the sleeve valve being connected by integral webs with adjacent portions oi' the cylinder.

9. The combination with a cylinder provided with a discharge passage and with a plurality oi' annularly disposed discharge ports located in different transverse planes spaced apart in a direction longitudinally of the cylinder, of a reciprocating piston in the cylinder, a sleeve valve located between the piston and cylinder and providedwith a plurality oiannularly disposed discharge ports inV different transverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valve for eli'ectingthe substantially simultaneous registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, a cylinder head provided with an extension projecting toward said piston and providing a substantially annular connecting passage extending longitudinally with respect to said cylinder for connectingV the discharge ports in one transverse plane with those in another transverse plane.

10. The combination with a cylinder provided with a discharge passage and with a plurality ot annularly disposed discharge ports located in ditlerenttransverse planes spaced apart in a. direction longitudinally oi the cylinder, ol a reciprocating piston in the cylinder7 a sleeve valve located between the piston and cylinder and provided with a plurality of annula-rly disposed discharge ports in dillerent transverse planes spaced apart in a direction longitudinally ot the valve and operative connections between said piston and sleeve valve for eli'ecting the substantially simultaneous registration et said dischargeA ports in the valve with those in the cylinder when the piston approaches the end et its compression strolre, a cylinder head provided with au extension projecting toward said piston and providing a substantialiy annular connecting passage extending longitudinally with respect to said cylinder for connecting the discharge ports in one transverse plane with those in another transverse )lane7 the portions of the cylinder located between the jtransverse planes of said discharge ports and in engagement with the valve being coni ected by integral webs with adjacent portions of the cylinder.

ll. The combination with a cylinder provided with a discharge passage and with a plurality of annularly disposed discharge ports located in dillerent transverse planes spacco apart in a direction longitudinally ot the cylinder, et a reciprocating piston in the cylinder7 al sleeve valve located between the piston and cylinder and provided with a pluality of annularly disposed discharge ports in different transverse planes spaced apart in a direction longitudinally et the valve and operative connections between said piston and sleeve valve for eitecting the substantially simultaneous registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end of its emnpression stroke, a cylinder head provided with an extension projecting toward said piston and providing a substantially annular connecting passage e-Itending longitudinally with respect to said cylinder 'tor connecting the discharge ports in one transverse plano with those in another transverse plane7 the portions of the cylinder head extension located between the transverse planes et' the said discharge ports engaging the inner sur- :tace of the sleeve valve and being connected with the cylinder head extension by supporting webs extending across the said substantially annular connecting passage.

l2. The combination with a cylinder prov'ded with a discharge passage and with a plurality of annularly disposed discharge ports located in different transverse planes spaced apart in a direction longitudinally of the cylinder, o'f a reciprocating piston in the cylinder, a sleeve valve located between the piston and cylinder and provided with a plurality of annularly disposed discharge ports in different transverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valve for effecting the substantially simultaneous registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, a cylinder head provided with an extension ot reduced diameter projecting toward the piston and within the sleeve valve and forming a substantially annular passage between said extension and the sleeve valve for connecting the discharge ports in said dillierent transverse planes for joint operation.

13. rl`he combination with a cylinder provded with a discharge passage and with a plurality of annularly disposed discharge ports located in different transverse planes, spaced apart in a. direction longitudinally oit' the cylinder, oi a reciprocating piston in the cylinder`r a sleeve valve located between the piston and cylinder and provided with a plurality of annularly disposed discharge ports in dillerent transverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valve for effecting the substantially simultaneous'registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end oll its compression stroke, a cylinder head provided with an extension of reduced diameter projecting toward the piston and within the sleeve valve and forming'a substantially annular passage between said extension and the sleeve valve orconnecting the discharge ports in said different transverse planes for joint operation, the portion of the cylinder between the said transverse planes engaging the outer tace of said sleeve valve, and being connected with the cylinder body by supporting webs.

14C. The combination with a cylinder provided with a discharge passage and with a plurality of annularly disposed discharge ports located in dillerent transverse planes spaced apart in a direction longitudinally of the cylinder7 ot a reciprocating piston in the cylinder, a sleeve valve located between the piston and cylinder and provided with a plurality of annularly` disposed discharge ports in differenttransverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valvefor effecting the substantially simultaneous registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, the head of the piston being provided with an extension of reduced diameter providing a substantially annular passage surrounding said extension for connecting said cylinder discharge ports in said different transverse planes for joint operation when said ports are in registration with the discharge ports in said sleeve valve.

15. The combination with a cylinder provided with a discharge passage and with a plurality of annularly disposed discharge ports located in different transverse planes spaced apart in a direction longitudinally of the cylinder', of a. reciprocating piston in the cylinder, a sleeve valve located between the piston and cylinder and provided with a plurality of annularly disposed discharge ports in dilierent transverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valve for effecting the substantially simultaneous registration of' said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, the head of the piston being provided with an extension of reduced diameter projecting within the sleeve valve, and providing a. substantially annular passage between said extension and said sleeve valve for connecting the cylinder discharge ports in said different transverse planes, when said ports are in registration with the discharge ports in the said sleeve valve. y

16. The combination with a cylinder provided with a discharge passage and with a plurality of annularly disposed discharge ports located in different transverse planes spaced apart in a direction longitudinally of the cylinder, of a reciprocating piston in the cylinder, a sleeve valve located between the piston and cylinder and provided with a plurality of annularly disposed discharge ports in diiferent transverse planes spaced apart in a direction longitudinally of the valve and operative connections between said piston and sleeve valve for eiiecting the substantially simultaneous registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, the head of the piston being provided with an extension of reduced diameter projecting within the sleeve valve, and providing a substantially annular passage between said extension and said sleeve valve for connecting the cylinder discharge ports in said diilerent transverse planes, when said ports are in registration with the discharge ports in the said sleeve valve, portions of the cylinder located between the transverse planes of said cylinder discharge ports engaging the outer surface of the sleeve valve and being connected with the cylinder body by supporting webs.

17. The combination with a cylinder provided with a discharge passage and with a plurality of annularly disposed discharge ports located in different transverse planes spaced apart in a direction longitudinally of the cylinder, of a reciprocating piston in the and operative connections between said piston and sleeve valve for effecting the substantially simultaneous registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, the head of the piston and the head of the cylinder being each provided with an extension of reduced diameter, said extensions projecting toward each other and providing a substantially annularpassage between them and the sleeve valve for connecting the cylinder discharge ports in said diiferent transverse planes when said ports are in registration with the discharge ports in the sleeve valve.

18. The combination with a cylinder provided with an inlet passage, inlet ports, a discharge passage, and annularly disposed dischargfl ports located in dilierent transverse planes spaced apart from each other in a direction longitudinally of the cylinder, said discharge ports being connected for oint operation, of a reciprocating piston in said cylinder, a reciprocating sleeve valve, interposed between the piston and cylinder, said sleeve valve being provided with a plurality of annularly disposed discharge ports in different transverse planes spaced apart in a direction longitudinally of the valve and with annularly disposed inlet ports located in a different transverse plane from either of the planes of said discharge ports therein, and operative connections between said piston and sleeve valve for effecting the registration oi' said inlet ports of the valve with the inlet ports of the cylinder during the suction stroke of the piston and for eiiecting the substantially simultaneous registration of said discharge ports in the valve with those in the cylinder when the piston approaches the end of its compression stroke, said cylinder being provided with a substantially annular passage extending longitudinally with respect to the same for connecting the discharge ports of the cylinder in said different transverse planes for joint operation.

In testimony whereof I aliiX my signature.

LEONARD OCHTMAN, JR. 

